Starskyharlow

Hi, I have a 1996 CBR F3, it started coughing at 6 1/2k revs. I have replaced the ignition coils, spark plugs, fitted a new in line fuel filter and new fuel pump, I've cleaned the in tank filter, balanced the carbs and redex treated the fuel.... On the way home today it started cutting out completely. The RAC chap thought it was fuel starvation which seems right, as soon as the carbs are empty it dies. Can anyone throw some light on this please as I am now completely lost. When it's running it's great... Any advice would be most welcome Thanks